diff options
Diffstat (limited to 'drivers/pci/controller/pcie-rcar-host.c')
| -rw-r--r-- | drivers/pci/controller/pcie-rcar-host.c | 1130 |
1 files changed, 1130 insertions, 0 deletions
diff --git a/drivers/pci/controller/pcie-rcar-host.c b/drivers/pci/controller/pcie-rcar-host.c new file mode 100644 index 000000000000..d210a36561be --- /dev/null +++ b/drivers/pci/controller/pcie-rcar-host.c @@ -0,0 +1,1130 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * PCIe driver for Renesas R-Car SoCs + * Copyright (C) 2014-2020 Renesas Electronics Europe Ltd + * + * Based on: + * arch/sh/drivers/pci/pcie-sh7786.c + * arch/sh/drivers/pci/ops-sh7786.c + * Copyright (C) 2009 - 2011 Paul Mundt + * + * Author: Phil Edworthy <phil.edworthy@renesas.com> + */ + +#include <linux/bitops.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/irqdomain.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/msi.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/of_pci.h> +#include <linux/of_platform.h> +#include <linux/pci.h> +#include <linux/phy/phy.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/slab.h> + +#include "pcie-rcar.h" + +struct rcar_msi { + DECLARE_BITMAP(used, INT_PCI_MSI_NR); + struct irq_domain *domain; + struct msi_controller chip; + unsigned long pages; + struct mutex lock; + int irq1; + int irq2; +}; + +static inline struct rcar_msi *to_rcar_msi(struct msi_controller *chip) +{ + return container_of(chip, struct rcar_msi, chip); +} + +/* Structure representing the PCIe interface */ +struct rcar_pcie_host { + struct rcar_pcie pcie; + struct device *dev; + struct phy *phy; + void __iomem *base; + struct list_head resources; + int root_bus_nr; + struct clk *bus_clk; + struct rcar_msi msi; + int (*phy_init_fn)(struct rcar_pcie_host *host); +}; + +static u32 rcar_read_conf(struct rcar_pcie *pcie, int where) +{ + unsigned int shift = BITS_PER_BYTE * (where & 3); + u32 val = rcar_pci_read_reg(pcie, where & ~3); + + return val >> shift; +} + +/* Serialization is provided by 'pci_lock' in drivers/pci/access.c */ +static int rcar_pcie_config_access(struct rcar_pcie_host *host, + unsigned char access_type, struct pci_bus *bus, + unsigned int devfn, int where, u32 *data) +{ + struct rcar_pcie *pcie = &host->pcie; + unsigned int dev, func, reg, index; + + dev = PCI_SLOT(devfn); + func = PCI_FUNC(devfn); + reg = where & ~3; + index = reg / 4; + + /* + * While each channel has its own memory-mapped extended config + * space, it's generally only accessible when in endpoint mode. + * When in root complex mode, the controller is unable to target + * itself with either type 0 or type 1 accesses, and indeed, any + * controller initiated target transfer to its own config space + * result in a completer abort. + * + * Each channel effectively only supports a single device, but as + * the same channel <-> device access works for any PCI_SLOT() + * value, we cheat a bit here and bind the controller's config + * space to devfn 0 in order to enable self-enumeration. In this + * case the regular ECAR/ECDR path is sidelined and the mangled + * config access itself is initiated as an internal bus transaction. + */ + if (pci_is_root_bus(bus)) { + if (dev != 0) + return PCIBIOS_DEVICE_NOT_FOUND; + + if (access_type == RCAR_PCI_ACCESS_READ) { + *data = rcar_pci_read_reg(pcie, PCICONF(index)); + } else { + /* Keep an eye out for changes to the root bus number */ + if (pci_is_root_bus(bus) && (reg == PCI_PRIMARY_BUS)) + host->root_bus_nr = *data & 0xff; + + rcar_pci_write_reg(pcie, *data, PCICONF(index)); + } + + return PCIBIOS_SUCCESSFUL; + } + + if (host->root_bus_nr < 0) + return PCIBIOS_DEVICE_NOT_FOUND; + + /* Clear errors */ + rcar_pci_write_reg(pcie, rcar_pci_read_reg(pcie, PCIEERRFR), PCIEERRFR); + + /* Set the PIO address */ + rcar_pci_write_reg(pcie, PCIE_CONF_BUS(bus->number) | + PCIE_CONF_DEV(dev) | PCIE_CONF_FUNC(func) | reg, PCIECAR); + + /* Enable the configuration access */ + if (bus->parent->number == host->root_bus_nr) + rcar_pci_write_reg(pcie, CONFIG_SEND_ENABLE | TYPE0, PCIECCTLR); + else + rcar_pci_write_reg(pcie, CONFIG_SEND_ENABLE | TYPE1, PCIECCTLR); + + /* Check for errors */ + if (rcar_pci_read_reg(pcie, PCIEERRFR) & UNSUPPORTED_REQUEST) + return PCIBIOS_DEVICE_NOT_FOUND; + + /* Check for master and target aborts */ + if (rcar_read_conf(pcie, RCONF(PCI_STATUS)) & + (PCI_STATUS_REC_MASTER_ABORT | PCI_STATUS_REC_TARGET_ABORT)) + return PCIBIOS_DEVICE_NOT_FOUND; + + if (access_type == RCAR_PCI_ACCESS_READ) + *data = rcar_pci_read_reg(pcie, PCIECDR); + else + rcar_pci_write_reg(pcie, *data, PCIECDR); + + /* Disable the configuration access */ + rcar_pci_write_reg(pcie, 0, PCIECCTLR); + + return PCIBIOS_SUCCESSFUL; +} + +static int rcar_pcie_read_conf(struct pci_bus *bus, unsigned int devfn, + int where, int size, u32 *val) +{ + struct rcar_pcie_host *host = bus->sysdata; + int ret; + + ret = rcar_pcie_config_access(host, RCAR_PCI_ACCESS_READ, + bus, devfn, where, val); + if (ret != PCIBIOS_SUCCESSFUL) { + *val = 0xffffffff; + return ret; + } + + if (size == 1) + *val = (*val >> (BITS_PER_BYTE * (where & 3))) & 0xff; + else if (size == 2) + *val = (*val >> (BITS_PER_BYTE * (where & 2))) & 0xffff; + + dev_dbg(&bus->dev, "pcie-config-read: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08x\n", + bus->number, devfn, where, size, *val); + + return ret; +} + +/* Serialization is provided by 'pci_lock' in drivers/pci/access.c */ +static int rcar_pcie_write_conf(struct pci_bus *bus, unsigned int devfn, + int where, int size, u32 val) +{ + struct rcar_pcie_host *host = bus->sysdata; + unsigned int shift; + u32 data; + int ret; + + ret = rcar_pcie_config_access(host, RCAR_PCI_ACCESS_READ, + bus, devfn, where, &data); + if (ret != PCIBIOS_SUCCESSFUL) + return ret; + + dev_dbg(&bus->dev, "pcie-config-write: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08x\n", + bus->number, devfn, where, size, val); + + if (size == 1) { + shift = BITS_PER_BYTE * (where & 3); + data &= ~(0xff << shift); + data |= ((val & 0xff) << shift); + } else if (size == 2) { + shift = BITS_PER_BYTE * (where & 2); + data &= ~(0xffff << shift); + data |= ((val & 0xffff) << shift); + } else + data = val; + + ret = rcar_pcie_config_access(host, RCAR_PCI_ACCESS_WRITE, + bus, devfn, where, &data); + + return ret; +} + +static struct pci_ops rcar_pcie_ops = { + .read = rcar_pcie_read_conf, + .write = rcar_pcie_write_conf, +}; + +static int rcar_pcie_setup(struct list_head *resource, + struct rcar_pcie_host *host) +{ + struct resource_entry *win; + int i = 0; + + /* Setup PCI resources */ + resource_list_for_each_entry(win, &host->resources) { + struct resource *res = win->res; + + if (!res->flags) + continue; + + switch (resource_type(res)) { + case IORESOURCE_IO: + case IORESOURCE_MEM: + rcar_pcie_set_outbound(&host->pcie, i, win); + i++; + break; + case IORESOURCE_BUS: + host->root_bus_nr = res->start; + break; + default: + continue; + } + + pci_add_resource(resource, res); + } + + return 1; +} + +static void rcar_pcie_force_speedup(struct rcar_pcie *pcie) +{ + struct device *dev = pcie->dev; + unsigned int timeout = 1000; + u32 macsr; + + if ((rcar_pci_read_reg(pcie, MACS2R) & LINK_SPEED) != LINK_SPEED_5_0GTS) + return; + + if (rcar_pci_read_reg(pcie, MACCTLR) & SPEED_CHANGE) { + dev_err(dev, "Speed change already in progress\n"); + return; + } + + macsr = rcar_pci_read_reg(pcie, MACSR); + if ((macsr & LINK_SPEED) == LINK_SPEED_5_0GTS) + goto done; + + /* Set target link speed to 5.0 GT/s */ + rcar_rmw32(pcie, EXPCAP(12), PCI_EXP_LNKSTA_CLS, + PCI_EXP_LNKSTA_CLS_5_0GB); + + /* Set speed change reason as intentional factor */ + rcar_rmw32(pcie, MACCGSPSETR, SPCNGRSN, 0); + + /* Clear SPCHGFIN, SPCHGSUC, and SPCHGFAIL */ + if (macsr & (SPCHGFIN | SPCHGSUC | SPCHGFAIL)) + rcar_pci_write_reg(pcie, macsr, MACSR); + + /* Start link speed change */ + rcar_rmw32(pcie, MACCTLR, SPEED_CHANGE, SPEED_CHANGE); + + while (timeout--) { + macsr = rcar_pci_read_reg(pcie, MACSR); + if (macsr & SPCHGFIN) { + /* Clear the interrupt bits */ + rcar_pci_write_reg(pcie, macsr, MACSR); + + if (macsr & SPCHGFAIL) + dev_err(dev, "Speed change failed\n"); + + goto done; + } + + msleep(1); + } + + dev_err(dev, "Speed change timed out\n"); + +done: + dev_info(dev, "Current link speed is %s GT/s\n", + (macsr & LINK_SPEED) == LINK_SPEED_5_0GTS ? "5" : "2.5"); +} + +static void rcar_pcie_hw_enable(struct rcar_pcie_host *host) +{ + struct rcar_pcie *pcie = &host->pcie; + struct resource_entry *win; + LIST_HEAD(res); + int i = 0; + + /* Try setting 5 GT/s link speed */ + rcar_pcie_force_speedup(pcie); + + /* Setup PCI resources */ + resource_list_for_each_entry(win, &host->resources) { + struct resource *res = win->res; + + if (!res->flags) + continue; + + switch (resource_type(res)) { + case IORESOURCE_IO: + case IORESOURCE_MEM: + rcar_pcie_set_outbound(pcie, i, win); + i++; + break; + } + } +} + +static int rcar_pcie_enable(struct rcar_pcie_host *host) +{ + struct pci_host_bridge *bridge = pci_host_bridge_from_priv(host); + struct rcar_pcie *pcie = &host->pcie; + struct device *dev = pcie->dev; + struct pci_bus *bus, *child; + int ret; + + /* Try setting 5 GT/s link speed */ + rcar_pcie_force_speedup(pcie); + + rcar_pcie_setup(&bridge->windows, host); + + pci_add_flags(PCI_REASSIGN_ALL_BUS); + + bridge->dev.parent = dev; + bridge->sysdata = host; + bridge->busnr = host->root_bus_nr; + bridge->ops = &rcar_pcie_ops; + bridge->map_irq = of_irq_parse_and_map_pci; + bridge->swizzle_irq = pci_common_swizzle; + if (IS_ENABLED(CONFIG_PCI_MSI)) + bridge->msi = &host->msi.chip; + + ret = pci_scan_root_bus_bridge(bridge); + if (ret < 0) + return ret; + + bus = bridge->bus; + + pci_bus_size_bridges(bus); + pci_bus_assign_resources(bus); + + list_for_each_entry(child, &bus->children, node) + pcie_bus_configure_settings(child); + + pci_bus_add_devices(bus); + + return 0; +} + +static int phy_wait_for_ack(struct rcar_pcie *pcie) +{ + struct device *dev = pcie->dev; + unsigned int timeout = 100; + + while (timeout--) { + if (rcar_pci_read_reg(pcie, H1_PCIEPHYADRR) & PHY_ACK) + return 0; + + udelay(100); + } + + dev_err(dev, "Access to PCIe phy timed out\n"); + + return -ETIMEDOUT; +} + +static void phy_write_reg(struct rcar_pcie *pcie, + unsigned int rate, u32 addr, + unsigned int lane, u32 data) +{ + u32 phyaddr; + + phyaddr = WRITE_CMD | + ((rate & 1) << RATE_POS) | + ((lane & 0xf) << LANE_POS) | + ((addr & 0xff) << ADR_POS); + + /* Set write data */ + rcar_pci_write_reg(pcie, data, H1_PCIEPHYDOUTR); + rcar_pci_write_reg(pcie, phyaddr, H1_PCIEPHYADRR); + + /* Ignore errors as they will be dealt with if the data link is down */ + phy_wait_for_ack(pcie); + + /* Clear command */ + rcar_pci_write_reg(pcie, 0, H1_PCIEPHYDOUTR); + rcar_pci_write_reg(pcie, 0, H1_PCIEPHYADRR); + + /* Ignore errors as they will be dealt with if the data link is down */ + phy_wait_for_ack(pcie); +} + +static int rcar_pcie_hw_init(struct rcar_pcie *pcie) +{ + int err; + + /* Begin initialization */ + rcar_pci_write_reg(pcie, 0, PCIETCTLR); + + /* Set mode */ + rcar_pci_write_reg(pcie, 1, PCIEMSR); + + err = rcar_pcie_wait_for_phyrdy(pcie); + if (err) + return err; + + /* + * Initial header for port config space is type 1, set the device + * class to match. Hardware takes care of propagating the IDSETR + * settings, so there is no need to bother with a quirk. + */ + rcar_pci_write_reg(pcie, PCI_CLASS_BRIDGE_PCI << 16, IDSETR1); + + /* + * Setup Secondary Bus Number & Subordinate Bus Number, even though + * they aren't used, to avoid bridge being detected as broken. + */ + rcar_rmw32(pcie, RCONF(PCI_SECONDARY_BUS), 0xff, 1); + rcar_rmw32(pcie, RCONF(PCI_SUBORDINATE_BUS), 0xff, 1); + + /* Initialize default capabilities. */ + rcar_rmw32(pcie, REXPCAP(0), 0xff, PCI_CAP_ID_EXP); + rcar_rmw32(pcie, REXPCAP(PCI_EXP_FLAGS), + PCI_EXP_FLAGS_TYPE, PCI_EXP_TYPE_ROOT_PORT << 4); + rcar_rmw32(pcie, RCONF(PCI_HEADER_TYPE), 0x7f, + PCI_HEADER_TYPE_BRIDGE); + + /* Enable data link layer active state reporting */ + rcar_rmw32(pcie, REXPCAP(PCI_EXP_LNKCAP), PCI_EXP_LNKCAP_DLLLARC, + PCI_EXP_LNKCAP_DLLLARC); + + /* Write out the physical slot number = 0 */ + rcar_rmw32(pcie, REXPCAP(PCI_EXP_SLTCAP), PCI_EXP_SLTCAP_PSN, 0); + + /* Set the completion timer timeout to the maximum 50ms. */ + rcar_rmw32(pcie, TLCTLR + 1, 0x3f, 50); + + /* Terminate list of capabilities (Next Capability Offset=0) */ + rcar_rmw32(pcie, RVCCAP(0), 0xfff00000, 0); + + /* Enable MSI */ + if (IS_ENABLED(CONFIG_PCI_MSI)) + rcar_pci_write_reg(pcie, 0x801f0000, PCIEMSITXR); + + rcar_pci_write_reg(pcie, MACCTLR_INIT_VAL, MACCTLR); + + /* Finish initialization - establish a PCI Express link */ + rcar_pci_write_reg(pcie, CFINIT, PCIETCTLR); + + /* This will timeout if we don't have a link. */ + err = rcar_pcie_wait_for_dl(pcie); + if (err) + return err; + + /* Enable INTx interrupts */ + rcar_rmw32(pcie, PCIEINTXR, 0, 0xF << 8); + + wmb(); + + return 0; +} + +static int rcar_pcie_phy_init_h1(struct rcar_pcie_host *host) +{ + struct rcar_pcie *pcie = &host->pcie; + + /* Initialize the phy */ + phy_write_reg(pcie, 0, 0x42, 0x1, 0x0EC34191); + phy_write_reg(pcie, 1, 0x42, 0x1, 0x0EC34180); + phy_write_reg(pcie, 0, 0x43, 0x1, 0x00210188); + phy_write_reg(pcie, 1, 0x43, 0x1, 0x00210188); + phy_write_reg(pcie, 0, 0x44, 0x1, 0x015C0014); + phy_write_reg(pcie, 1, 0x44, 0x1, 0x015C0014); + phy_write_reg(pcie, 1, 0x4C, 0x1, 0x786174A0); + phy_write_reg(pcie, 1, 0x4D, 0x1, 0x048000BB); + phy_write_reg(pcie, 0, 0x51, 0x1, 0x079EC062); + phy_write_reg(pcie, 0, 0x52, 0x1, 0x20000000); + phy_write_reg(pcie, 1, 0x52, 0x1, 0x20000000); + phy_write_reg(pcie, 1, 0x56, 0x1, 0x00003806); + + phy_write_reg(pcie, 0, 0x60, 0x1, 0x004B03A5); + phy_write_reg(pcie, 0, 0x64, 0x1, 0x3F0F1F0F); + phy_write_reg(pcie, 0, 0x66, 0x1, 0x00008000); + + return 0; +} + +static int rcar_pcie_phy_init_gen2(struct rcar_pcie_host *host) +{ + struct rcar_pcie *pcie = &host->pcie; + + /* + * These settings come from the R-Car Series, 2nd Generation User's + * Manual, section 50.3.1 (2) Initialization of the physical layer. + */ + rcar_pci_write_reg(pcie, 0x000f0030, GEN2_PCIEPHYADDR); + rcar_pci_write_reg(pcie, 0x00381203, GEN2_PCIEPHYDATA); + rcar_pci_write_reg(pcie, 0x00000001, GEN2_PCIEPHYCTRL); + rcar_pci_write_reg(pcie, 0x00000006, GEN2_PCIEPHYCTRL); + + rcar_pci_write_reg(pcie, 0x000f0054, GEN2_PCIEPHYADDR); + /* The following value is for DC connection, no termination resistor */ + rcar_pci_write_reg(pcie, 0x13802007, GEN2_PCIEPHYDATA); + rcar_pci_write_reg(pcie, 0x00000001, GEN2_PCIEPHYCTRL); + rcar_pci_write_reg(pcie, 0x00000006, GEN2_PCIEPHYCTRL); + + return 0; +} + +static int rcar_pcie_phy_init_gen3(struct rcar_pcie_host *host) +{ + int err; + + err = phy_init(host->phy); + if (err) + return err; + + err = phy_power_on(host->phy); + if (err) + phy_exit(host->phy); + + return err; +} + +static int rcar_msi_alloc(struct rcar_msi *chip) +{ + int msi; + + mutex_lock(&chip->lock); + + msi = find_first_zero_bit(chip->used, INT_PCI_MSI_NR); + if (msi < INT_PCI_MSI_NR) + set_bit(msi, chip->used); + else + msi = -ENOSPC; + + mutex_unlock(&chip->lock); + + return msi; +} + +static int rcar_msi_alloc_region(struct rcar_msi *chip, int no_irqs) +{ + int msi; + + mutex_lock(&chip->lock); + msi = bitmap_find_free_region(chip->used, INT_PCI_MSI_NR, + order_base_2(no_irqs)); + mutex_unlock(&chip->lock); + + return msi; +} + +static void rcar_msi_free(struct rcar_msi *chip, unsigned long irq) +{ + mutex_lock(&chip->lock); + clear_bit(irq, chip->used); + mutex_unlock(&chip->lock); +} + +static irqreturn_t rcar_pcie_msi_irq(int irq, void *data) +{ + struct rcar_pcie_host *host = data; + struct rcar_pcie *pcie = &host->pcie; + struct rcar_msi *msi = &host->msi; + struct device *dev = pcie->dev; + unsigned long reg; + + reg = rcar_pci_read_reg(pcie, PCIEMSIFR); + + /* MSI & INTx share an interrupt - we only handle MSI here */ + if (!reg) + return IRQ_NONE; + + while (reg) { + unsigned int index = find_first_bit(®, 32); + unsigned int msi_irq; + + /* clear the interrupt */ + rcar_pci_write_reg(pcie, 1 << index, PCIEMSIFR); + + msi_irq = irq_find_mapping(msi->domain, index); + if (msi_irq) { + if (test_bit(index, msi->used)) + generic_handle_irq(msi_irq); + else + dev_info(dev, "unhandled MSI\n"); + } else { + /* Unknown MSI, just clear it */ + dev_dbg(dev, "unexpected MSI\n"); + } + + /* see if there's any more pending in this vector */ + reg = rcar_pci_read_reg(pcie, PCIEMSIFR); + } + + return IRQ_HANDLED; +} + +static int rcar_msi_setup_irq(struct msi_controller *chip, struct pci_dev *pdev, + struct msi_desc *desc) +{ + struct rcar_msi *msi = to_rcar_msi(chip); + struct rcar_pcie_host *host = container_of(chip, struct rcar_pcie_host, + msi.chip); + struct rcar_pcie *pcie = &host->pcie; + struct msi_msg msg; + unsigned int irq; + int hwirq; + + hwirq = rcar_msi_alloc(msi); + if (hwirq < 0) + return hwirq; + + irq = irq_find_mapping(msi->domain, hwirq); + if (!irq) { + rcar_msi_free(msi, hwirq); + return -EINVAL; + } + + irq_set_msi_desc(irq, desc); + + msg.address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE; + msg.address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR); + msg.data = hwirq; + + pci_write_msi_msg(irq, &msg); + + return 0; +} + +static int rcar_msi_setup_irqs(struct msi_controller *chip, + struct pci_dev *pdev, int nvec, int type) +{ + struct rcar_msi *msi = to_rcar_msi(chip); + struct rcar_pcie_host *host = container_of(chip, struct rcar_pcie_host, + msi.chip); + struct rcar_pcie *pcie = &host->pcie; + struct msi_desc *desc; + struct msi_msg msg; + unsigned int irq; + int hwirq; + int i; + + /* MSI-X interrupts are not supported */ + if (type == PCI_CAP_ID_MSIX) + return -EINVAL; + + WARN_ON(!list_is_singular(&pdev->dev.msi_list)); + desc = list_entry(pdev->dev.msi_list.next, struct msi_desc, list); + + hwirq = rcar_msi_alloc_region(msi, nvec); + if (hwirq < 0) + return -ENOSPC; + + irq = irq_find_mapping(msi->domain, hwirq); + if (!irq) + return -ENOSPC; + + for (i = 0; i < nvec; i++) { + /* + * irq_create_mapping() called from rcar_pcie_probe() pre- + * allocates descs, so there is no need to allocate descs here. + * We can therefore assume that if irq_find_mapping() above + * returns non-zero, then the descs are also successfully + * allocated. + */ + if (irq_set_msi_desc_off(irq, i, desc)) { + /* TODO: clear */ + return -EINVAL; + } + } + + desc->nvec_used = nvec; + desc->msi_attrib.multiple = order_base_2(nvec); + + msg.address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE; + msg.address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR); + msg.data = hwirq; + + pci_write_msi_msg(irq, &msg); + + return 0; +} + +static void rcar_msi_teardown_irq(struct msi_controller *chip, unsigned int irq) +{ + struct rcar_msi *msi = to_rcar_msi(chip); + struct irq_data *d = irq_get_irq_data(irq); + + rcar_msi_free(msi, d->hwirq); +} + +static struct irq_chip rcar_msi_irq_chip = { + .name = "R-Car PCIe MSI", + .irq_enable = pci_msi_unmask_irq, + .irq_disable = pci_msi_mask_irq, + .irq_mask = pci_msi_mask_irq, + .irq_unmask = pci_msi_unmask_irq, +}; + +static int rcar_msi_map(struct irq_domain *domain, unsigned int irq, + irq_hw_number_t hwirq) +{ + irq_set_chip_and_handler(irq, &rcar_msi_irq_chip, handle_simple_irq); + irq_set_chip_data(irq, domain->host_data); + + return 0; +} + +static const struct irq_domain_ops msi_domain_ops = { + .map = rcar_msi_map, +}; + +static void rcar_pcie_unmap_msi(struct rcar_pcie_host *host) +{ + struct rcar_msi *msi = &host->msi; + int i, irq; + + for (i = 0; i < INT_PCI_MSI_NR; i++) { + irq = irq_find_mapping(msi->domain, i); + if (irq > 0) + irq_dispose_mapping(irq); + } + + irq_domain_remove(msi->domain); +} + +static void rcar_pcie_hw_enable_msi(struct rcar_pcie_host *host) +{ + struct rcar_pcie *pcie = &host->pcie; + struct rcar_msi *msi = &host->msi; + unsigned long base; + + /* setup MSI data target */ + base = virt_to_phys((void *)msi->pages); + + rcar_pci_write_reg(pcie, lower_32_bits(base) | MSIFE, PCIEMSIALR); + rcar_pci_write_reg(pcie, upper_32_bits(base), PCIEMSIAUR); + + /* enable all MSI interrupts */ + rcar_pci_write_reg(pcie, 0xffffffff, PCIEMSIIER); +} + +static int rcar_pcie_enable_msi(struct rcar_pcie_host *host) +{ + struct rcar_pcie *pcie = &host->pcie; + struct device *dev = pcie->dev; + struct rcar_msi *msi = &host->msi; + int err, i; + + mutex_init(&msi->lock); + + msi->chip.dev = dev; + msi->chip.setup_irq = rcar_msi_setup_irq; + msi->chip.setup_irqs = rcar_msi_setup_irqs; + msi->chip.teardown_irq = rcar_msi_teardown_irq; + + msi->domain = irq_domain_add_linear(dev->of_node, INT_PCI_MSI_NR, + &msi_domain_ops, &msi->chip); + if (!msi->domain) { + dev_err(dev, "failed to create IRQ domain\n"); + return -ENOMEM; + } + + for (i = 0; i < INT_PCI_MSI_NR; i++) + irq_create_mapping(msi->domain, i); + + /* Two irqs are for MSI, but they are also used for non-MSI irqs */ + err = devm_request_irq(dev, msi->irq1, rcar_pcie_msi_irq, + IRQF_SHARED | IRQF_NO_THREAD, + rcar_msi_irq_chip.name, host); + if (err < 0) { + dev_err(dev, "failed to request IRQ: %d\n", err); + goto err; + } + + err = devm_request_irq(dev, msi->irq2, rcar_pcie_msi_irq, + IRQF_SHARED | IRQF_NO_THREAD, + rcar_msi_irq_chip.name, host); + if (err < 0) { + dev_err(dev, "failed to request IRQ: %d\n", err); + goto err; + } + + /* setup MSI data target */ + msi->pages = __get_free_pages(GFP_KERNEL, 0); + rcar_pcie_hw_enable_msi(host); + + return 0; + +err: + rcar_pcie_unmap_msi(host); + return err; +} + +static void rcar_pcie_teardown_msi(struct rcar_pcie_host *host) +{ + struct rcar_pcie *pcie = &host->pcie; + struct rcar_msi *msi = &host->msi; + + /* Disable all MSI interrupts */ + rcar_pci_write_reg(pcie, 0, PCIEMSIIER); + + /* Disable address decoding of the MSI interrupt, MSIFE */ + rcar_pci_write_reg(pcie, 0, PCIEMSIALR); + + free_pages(msi->pages, 0); + + rcar_pcie_unmap_msi(host); +} + +static int rcar_pcie_get_resources(struct rcar_pcie_host *host) +{ + struct rcar_pcie *pcie = &host->pcie; + struct device *dev = pcie->dev; + struct resource res; + int err, i; + + host->phy = devm_phy_optional_get(dev, "pcie"); + if (IS_ERR(host->phy)) + return PTR_ERR(host->phy); + + err = of_address_to_resource(dev->of_node, 0, &res); + if (err) + return err; + + pcie->base = devm_ioremap_resource(dev, &res); + if (IS_ERR(pcie->base)) + return PTR_ERR(pcie->base); + + host->bus_clk = devm_clk_get(dev, "pcie_bus"); + if (IS_ERR(host->bus_clk)) { + dev_err(dev, "cannot get pcie bus clock\n"); + return PTR_ERR(host->bus_clk); + } + + i = irq_of_parse_and_map(dev->of_node, 0); + if (!i) { + dev_err(dev, "cannot get platform resources for msi interrupt\n"); + err = -ENOENT; + goto err_irq1; + } + host->msi.irq1 = i; + + i = irq_of_parse_and_map(dev->of_node, 1); + if (!i) { + dev_err(dev, "cannot get platform resources for msi interrupt\n"); + err = -ENOENT; + goto err_irq2; + } + host->msi.irq2 = i; + + return 0; + +err_irq2: + irq_dispose_mapping(host->msi.irq1); +err_irq1: + return err; +} + +static int rcar_pcie_inbound_ranges(struct rcar_pcie *pcie, + struct resource_entry *entry, + int *index) +{ + u64 restype = entry->res->flags; + u64 cpu_addr = entry->res->start; + u64 cpu_end = entry->res->end; + u64 pci_addr = entry->res->start - entry->offset; + u32 flags = LAM_64BIT | LAR_ENABLE; + u64 mask; + u64 size = resource_size(entry->res); + int idx = *index; + + if (restype & IORESOURCE_PREFETCH) + flags |= LAM_PREFETCH; + + while (cpu_addr < cpu_end) { + if (idx >= MAX_NR_INBOUND_MAPS - 1) { + dev_err(pcie->dev, "Failed to map inbound regions!\n"); + return -EINVAL; + } + /* + * If the size of the range is larger than the alignment of + * the start address, we have to use multiple entries to + * perform the mapping. + */ + if (cpu_addr > 0) { + unsigned long nr_zeros = __ffs64(cpu_addr); + u64 alignment = 1ULL << nr_zeros; + + size = min(size, alignment); + } + /* Hardware supports max 4GiB inbound region */ + size = min(size, 1ULL << 32); + + mask = roundup_pow_of_two(size) - 1; + mask &= ~0xf; + + rcar_pcie_set_inbound(pcie, cpu_addr, pci_addr, + lower_32_bits(mask) | flags, idx, true); + + pci_addr += size; + cpu_addr += size; + idx += 2; + } + *index = idx; + + return 0; +} + +static int rcar_pcie_parse_map_dma_ranges(struct rcar_pcie_host *host) +{ + struct pci_host_bridge *bridge = pci_host_bridge_from_priv(host); + struct resource_entry *entry; + int index = 0, err = 0; + + resource_list_for_each_entry(entry, &bridge->dma_ranges) { + err = rcar_pcie_inbound_ranges(&host->pcie, entry, &index); + if (err) + break; + } + + return err; +} + +static const struct of_device_id rcar_pcie_of_match[] = { + { .compatible = "renesas,pcie-r8a7779", + .data = rcar_pcie_phy_init_h1 }, + { .compatible = "renesas,pcie-r8a7790", + .data = rcar_pcie_phy_init_gen2 }, + { .compatible = "renesas,pcie-r8a7791", + .data = rcar_pcie_phy_init_gen2 }, + { .compatible = "renesas,pcie-rcar-gen2", + .data = rcar_pcie_phy_init_gen2 }, + { .compatible = "renesas,pcie-r8a7795", + .data = rcar_pcie_phy_init_gen3 }, + { .compatible = "renesas,pcie-rcar-gen3", + .data = rcar_pcie_phy_init_gen3 }, + {}, +}; + +static int rcar_pcie_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct rcar_pcie_host *host; + struct rcar_pcie *pcie; + u32 data; + int err; + struct pci_host_bridge *bridge; + + bridge = pci_alloc_host_bridge(sizeof(*host)); + if (!bridge) + return -ENOMEM; + + host = pci_host_bridge_priv(bridge); + pcie = &host->pcie; + pcie->dev = dev; + platform_set_drvdata(pdev, host); + + err = pci_parse_request_of_pci_ranges(dev, &host->resources, + &bridge->dma_ranges, NULL); + if (err) + goto err_free_bridge; + + pm_runtime_enable(pcie->dev); + err = pm_runtime_get_sync(pcie->dev); + if (err < 0) { + dev_err(pcie->dev, "pm_runtime_get_sync failed\n"); + goto err_pm_disable; + } + + err = rcar_pcie_get_resources(host); + if (err < 0) { + dev_err(dev, "failed to request resources: %d\n", err); + goto err_pm_put; + } + + err = clk_prepare_enable(host->bus_clk); + if (err) { + dev_err(dev, "failed to enable bus clock: %d\n", err); + goto err_unmap_msi_irqs; + } + + err = rcar_pcie_parse_map_dma_ranges(host); + if (err) + goto err_clk_disable; + + host->phy_init_fn = of_device_get_match_data(dev); + err = host->phy_init_fn(host); + if (err) { + dev_err(dev, "failed to init PCIe PHY\n"); + goto err_clk_disable; + } + + /* Failure to get a link might just be that no cards are inserted */ + if (rcar_pcie_hw_init(pcie)) { + dev_info(dev, "PCIe link down\n"); + err = -ENODEV; + goto err_phy_shutdown; + } + + data = rcar_pci_read_reg(pcie, MACSR); + dev_info(dev, "PCIe x%d: link up\n", (data >> 20) & 0x3f); + + if (IS_ENABLED(CONFIG_PCI_MSI)) { + err = rcar_pcie_enable_msi(host); + if (err < 0) { + dev_err(dev, + "failed to enable MSI support: %d\n", + err); + goto err_phy_shutdown; + } + } + + err = rcar_pcie_enable(host); + if (err) + goto err_msi_teardown; + + return 0; + +err_msi_teardown: + if (IS_ENABLED(CONFIG_PCI_MSI)) + rcar_pcie_teardown_msi(host); + +err_phy_shutdown: + if (host->phy) { + phy_power_off(host->phy); + phy_exit(host->phy); + } + +err_clk_disable: + clk_disable_unprepare(host->bus_clk); + +err_unmap_msi_irqs: + irq_dispose_mapping(host->msi.irq2); + irq_dispose_mapping(host->msi.irq1); + +err_pm_put: + pm_runtime_put(dev); + +err_pm_disable: + pm_runtime_disable(dev); + pci_free_resource_list(&host->resources); + +err_free_bridge: + pci_free_host_bridge(bridge); + + return err; +} + +static int __maybe_unused rcar_pcie_resume(struct device *dev) +{ + struct rcar_pcie_host *host = dev_get_drvdata(dev); + struct rcar_pcie *pcie = &host->pcie; + unsigned int data; + int err; + + err = rcar_pcie_parse_map_dma_ranges(host); + if (err) + return 0; + + /* Failure to get a link might just be that no cards are inserted */ + err = host->phy_init_fn(host); + if (err) { + dev_info(dev, "PCIe link down\n"); + return 0; + } + + data = rcar_pci_read_reg(pcie, MACSR); + dev_info(dev, "PCIe x%d: link up\n", (data >> 20) & 0x3f); + + /* Enable MSI */ + if (IS_ENABLED(CONFIG_PCI_MSI)) + rcar_pcie_hw_enable_msi(host); + + rcar_pcie_hw_enable(host); + + return 0; +} + +static int rcar_pcie_resume_noirq(struct device *dev) +{ + struct rcar_pcie_host *host = dev_get_drvdata(dev); + struct rcar_pcie *pcie = &host->pcie; + + if (rcar_pci_read_reg(pcie, PMSR) && + !(rcar_pci_read_reg(pcie, PCIETCTLR) & DL_DOWN)) + return 0; + + /* Re-establish the PCIe link */ + rcar_pci_write_reg(pcie, MACCTLR_INIT_VAL, MACCTLR); + rcar_pci_write_reg(pcie, CFINIT, PCIETCTLR); + return rcar_pcie_wait_for_dl(pcie); +} + +static const struct dev_pm_ops rcar_pcie_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(NULL, rcar_pcie_resume) + .resume_noirq = rcar_pcie_resume_noirq, +}; + +static struct platform_driver rcar_pcie_driver = { + .driver = { + .name = "rcar-pcie", + .of_match_table = rcar_pcie_of_match, + .pm = &rcar_pcie_pm_ops, + .suppress_bind_attrs = true, + }, + .probe = rcar_pcie_probe, +}; +builtin_platform_driver(rcar_pcie_driver); |